Table 1
Log of IRAM observations.
| UT date | ⟨rh ⟩ | ⟨Δ ⟩ | Offset | Integ. time | Freq. range |
|---|---|---|---|---|---|
| (yyyy/mm/dd.d–dd.d) | (AU) | (AU) | (′′)a | (min)b | (GHz) |
| 2018/01/23.78–23.84 | 2.832 | 2.214 | 3.0 | 61.0 | 224.9–232.7, 240.5–248.3 |
| 23.87–23.95 | 2.832 | 2.216 | 2.3 | 74.7 | 248.7–256.5, 264.4–272.2 |
| 23.98–24.04 | 2.831 | 2.217 | 3.9 | 56.0 | 146.9–154.7, 162.6–170.4 |
| 2018/01/24.71–24.86 | 2.828 | 2.224 | 2.7 | 147 | 212.8–220.5, 228.4–236.2 |
| 24.88–24.91 | 2.828 | 2.225 | 1.9 | 28.0 | 248.7–256.5, 264.4–272.2 |
Notes. (a)Residual pointing offset (relative to the position of peak intensity measured on coarse maps) for the “On” nucleus pointings. (b)“On” nucleus pointings. But the first tuning of each day includes 15 and 22 min (23.8 and 24.8 January, respectively) spent at 5–14′′ pointing offsets whencoarse mapping was carried out.
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